Using named Pipes between PHP and ZIP

["Dennis Heck" <news@xxxxxxxxxxxxx>]

Hello everyone,

I'm looking for a solution for the following:
1) collecting data from a simple html form and send them to a php script
2) take the data and place them in a php-generated excel sheet
3) zip the excel sheet and password protect the zip file (standard 
encription will be sufficent, no AES needed)
4) send the zip file as an email attachment
This kind of output is fixed, changing the output is not an option.

I'm ok with building the excel sheet and sending the mail, but I'm still 
trying and error with the zip. Since I need password protection in the zip, 
I cannot use the php build in zip extension. I guess I will need to call ZIP 
on the shell. I'm aware I could first save the generated excel sheet to the 
filesystem and afterwards call the zip process on the file, putting the zip 
file also to the file system. But I wonder if there's an option to stream 
the data till they finally can be put to the multipart mail - without saving 
anything to the filesystem.

Here is my first try, just a little modification of the example on proc_open 
in the php docu. To keep the test simple, I load a sample xls from the 
filesystem instead of generating from the php class and output it directly 
to the browser. The script works well except one point: the file contained 
in the zip will have no name an no file extension.

   <?php
   header ('Content-type: application/zip');
   header ('Content-Disposition: attachment; filename="download.zip"');

   $descriptorspec = array(
       0 => array("pipe", "r"),
      1 => array("pipe", "w"),
      2 => array("file", "error-output.txt", "a")
   );

   $dateiname = 'xyz.xls';
   $file = fread(fopen($dateiname, "r"), filesize($dateiname));

   $process = proc_open('zip -P 1234', $descriptorspec, $pipes);

   if (is_resource($process)) {

       fwrite($pipes[0], $file);
       fclose($pipes[0]);

       $zip = stream_get_contents($pipes[1]);
       fclose($pipes[1]);

       $return_value = proc_close($process);
   }

   echo $zip;
   ?>

So I look for an option to get the name and extension in the zipfile. Here I 
found named pipes as an option. Calling via shell, tested with a textfile in 
order to use less

   mkfifo xyz.txt
   less readme.txt > xyz.txt & zip output.zip -FI xyz.txt -P 1234
   rm xyz.txt

Now I get a pw protected zip file containing xyz.txt. Now how can I combine 
both? How can I tell php to use the named pipe instead of stdin in 
proc_open? Or any other idea to get the file in the zip the correct name and 
extension.

Thanks in advance,
Regards,
Dennis



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